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Paul Zigerli received US Patent No. 2,158,954 on May 16, 1939, filed May 26, 1936.
The patent's description opens (from the scanned text):
The present invention relates to a new and improved method of purification of sewage or waste liquors and to filters adapted to be used for carrying out said method.
- Author
- Paul Zigerli
- Published by
- US Patent Office
- Series
- US Patent No. 2,158,954
- Date
- May 16, 1939
- Library no.
- ACL Doc 23626 · asbestosclaims.law/library/23626
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 2 pages · 219 KB
Where it was listed
- Asbestos, February 1940, in its patents department (the year's issues)
- Asbestos, April 1941, in its patents department (the year's issues)
Cite this document
Paul Zigerli. “Sewage Treatment Patent (Z-Process of Sewage Treatment) (US Patent 2,158,954, 1939).” May 16, 1939. US Patent No. 2,158,954. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23626. https://asbestosclaims.law/library/23626.
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